| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $24,398 | $15,181 |
| 2016 | $27,588 | $18,260 |
| 2017 | $28,111 | $18,628 |
| 2018 | $28,111 | $18,428 |
| 2019 | $28,706 | $19,162 |
| 2020 | $29,338 | $19,794 |
| 2021* | $29,960 | $20,447 |
| 2022* | $30,595 | $21,122 |
| 2023* | $31,244 | $21,819 |
| 2024* | $31,906 | $22,539 |
| 2025* | $32,583 | $23,283 |